| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 338 |
1.6%
|
| 2 | Weekly | 1275 |
5.9%
|
| 3 | Monthly | 2219 |
10.2%
|
| 4 | Yearly | 855 |
3.9%
|
| 5 | Not at all | 16990 |
78.4%
|
| Sysmiss | 3431 |